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Meaning of lead-pipe cinch

lead'-pipe cinch'

Pronunciation: (led'pīp"), [key]
— Slang. Slang.
  1. an absolute certainty: It's a lead-pipe cinch they'll be there.
  2. something very easy to accomplish: Getting him elected will be a lead-pipe cinch.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.